Mix shortening, sugar and eggs together thoroughly.,Stir in mashed bananas and vanilla.,Add sifted dry ingredients alternately with milk.,Blend in dates and nuts.,Pour into well-greased and lightly floured 9-inch square pan.,Bake in a moderate oven (350°) for 40 to 45 minutes.,______,Frost with lemon or orange confectioners sugar icing or cut into squares and serve with whipped cream and banana slices.